Class Enum java

Question

I have this enum class.

When I call the controller it gives me null

public enum Gender {

    MALE("Male", "M"),
    FEMALE("Female", "F"),
    OTHER("OTHER", "O");

    private String description;
    private String value;


    private Gender(String description, String value) {
        description = description;
        value = value;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    @Override
    public String toString() {
        return description;
    }
}


List<Gender> listGender = Arrays.asList(Gender.values());
for (Gender o : Gender.values()) {
   System.out.println(o.toString());
}

Answer null

Thanks for what you can help me

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Fabienr_75 · Accepted Answer · 2017-01-20 22:11:59Z

2

You made a mistake inside the enum constructor. Use the keyword this to assign value to object's attributes (an enum is an object).

private Gender(String description, String value) {
    this.description = description;
    this.value = value;
}

edited Jan 20, 2017 at 22:11

answered Jan 20, 2017 at 21:58

Fabienr_75

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3 Comments

ammf18 Over a year ago

I was wrong to copy it and do not modify the constructor

Fabienr_75 Over a year ago

You need to initialize attributes in the constructor Gender, using this keyword before the attribute's names. Without that the attribute stay null because the variables description and value referred to method's parameters and not to the class attributes.

Andreas Dolk Over a year ago

this is all it needs

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